Effects of Chitin Synthesis Inhibitors on German Cockroach (Orthoptera: Blattellidae) Mortality and Reproduction

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Four benzoylphenyl urea and one substituted melamine chitin synthesis inhibitors were evaluated for their potential to control German cockroaches, Blattella germanica (L.). Chitin synthesis inhibitors fed to adult German cockroaches as 0.25% baits during only the first othecal cycle resulted in a darkening of othecal coloration and reduced egg hatch. Effects persisted to the second othecal cycle even though the feeding of treated bait was discontinued. By the third othecal cycle, reproduction returned to normal. Exposure of nymphs to residues or feeding of 0.25%baits resulted in 100%nymphal mortality for the benzoyIphenyl ureas CGA--112913 N -[[[3,5-dichloro-4-[[3-chlore-t-(trifluoromethyl)-2-pyridinyl] oxy])phenyl]amino]-carbonyl]-2,6-difl- uorobenzamide)and UC-84572. UC-84572 significantly reduced nymphal populations from 5-12 wk after treatment as a 0.25%bait. Sprays applied at 22.9 /Jog/cm2did not result in a high degree of control of German cockroach nymphs; however, an increased rate of 45.8 /Jog/cm2did provide reliable control. The chlorpyrifos standard did not significantly reduce nymphal populations until after 5 wk after treatment.

Document Type: Research Article

Publication date: February 1, 1989

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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